District of



July 1 w. J. DOW

VARIABLE CONDENSER Filed March 25. 1925 4 Sheets-Sheet IlIflllllll lll0lllll I'IOIIIII g] flwntoz William J. flow July 2, 1929. w, J ow 1.719.600

VARIABLE CONDENSER Filed March 25. 1925 4 Sheets-Sheet 2 William .1 1w

July 2, 1929. w, ow 1,719,600

VARIABLE CONDENSER Filed March 25. 1925 4 Sheets-Sheet 3 mlliam J flow airman July 2, 1929. w. J. DOW 1.719.600

VARIABLE CONDENSER Filed March 25. 1925 4 Sheets-Sheet 4 Fig.1.? F1 16 William J. 0010 tai ed Patented July 2, 1929.

PATENT. OFFICE.

' WILLIAM J.'DOW, OF WA HINGTON; DISTRICT OF'COLUMBIA.

- VARIABLE CONDENSER.

densers and in particular 'to;that;type..of

variable condensenwherein'; t wo interleaved sets of relatively ;movahle plate s; are emn a .'i te ttetetile nowhe eawaii? 9 e e t wha t lt l 'yifo ln Ai eth a Jaate .9 P m vide in such comhina on n:eans -;fo r .si nulae s i s i i helrefqael ment a selectively Qadj usting 7 one of the stator elements ,but .it is contemplated; that the commen od e pr v d 2; means f or simultaneously adjusting the sewa maeaid 'slpfi i ya li st ng h .1A efl e -bbie q th t me. vide acorribinatioh of con enser unit s whieh wi l be. a raea e-ie emalleable e! 2. twi twathiaenema i t emai s. -en tion,,and ec mlcalto Other objec ,i illA-iapiiat wh, i 1 .i ti nl fithijsiim nt qnfi 1 Apparatus .of, haraetelf .i articularly a ap ed. for" use le 9-- e v fl .a cui ts wherein; several stages of amplification remp y I H eretofor'e -ithi1 s been,,the .cornmon practice to employ a variabie'condenserin each stage of amplification tqproperly, tune f the various circuits to thewave l'engtli of the signal received, and adjust each condenser by trial settings until all of the 'circuits a're tuned to fgifje theif desired signal strength If itis' desired to receive signals transmitted on faj i t. wer l a h; the a irb re,- ti g he va,' 1 o i,s.- Q. 1 de one by Z becomes tedious involves too great time element; .gs a1 w re sev ral. sta es Z: .B e P emyin e l iqrid f t na e sit-t e i dense -l s m y b given simultaneously}. an approxima te in itialz". setting and. any .one ofsaid condenser units may be further selectively adjusted.

This application is a continuation inf-part of application SerialN 0. 709.804; of William i controls; r

. fg a pii ati ii filed atches, 1925. Serial No; 18,127.

. Iii tiledi-aivingkf f Figure ,1 is .a front view of three condenser unitsassembled according to my invention in rear of a panel; i

ig. Zisasimilar view with the panel removed;

' Fig. 3 is a rear view;

a detailed plan view of .a concentric shaft controltaken' on line 4-4 of Fig. Fig. 5 is a.detail ed viewof the selective cam. stator control ofFig. :1; v

Fig. G 1i s an isometric View showing a modified arrangement of staggered condens er. units wherein the stators are siinultane ously adjustable;

Fig. 7 isa'detailed plan .view ofa modi fied concentric shaft, controlv employing a central shaft for asi'niultaneous statorcontrol and sleeve and carn assembly for sel ec tiive r otor .control; a Fig. 8 .shows a selectivewcam rotor control adapted for ,use with the modification v ofFig. 6

Fig. 11 is a of showele otivefcontrol.foricentral and outer S or; elements;

Fig. 1 2 isa modification ishowing 'a re-. moteconcentric control for the ;stator elements;

Fig. l3 lS'ZLll'lOdlfiCfitlQIl showing a=rem0te conti'ol'foi: rotor and stator elements;

FiguM- is a modification ofFig. 1 1;

15 is.a.f urther modification of Fig. and. I i' l Fig. 1G a modification showing a series of condensers .alined axially.

Referring in detail to the drawings, numeral l indicatessets-of rotor plates and 2 indicatesse ts ofstator plat-esof condensers. Thefroto r sets far e mounted to rotate with shafts-3 respectively while thestator sets are mountedfso asito he adjustable onsaid shafts. While I have shown thredcondenser units partially supported on-panel 4; two or more units inay beruseda- A bar 5 is provided on the rear end of each shaft 3, the corresponding ends of .these bars being pivotallyiconnectedto linkbars 6 whereby-when central shaft 3 is ,.rotated.by dialknob ,7, a corresponding rotation is given simultaneously to each end shaft.

' to is rotated. Links 12 has Surrounding any one of shafts 3, preferably the central one, and rotatable thereon, are proyid'edtafsezg'esbf COI'LZCEQtIiQISlQGVQliKg shafts gachdiai iiig a levei and {team 11 rigidly mounted thereon. A ,link 12 is rigidly conneeted to each rnovable stator element and at its free end loosely engages a corresponding cam 11 whereby .whe'n zanyt site sides. It is obvious that the .rh'ii fbf adjustment of each s tat or 'ib' t'e t'ei able around ro t-oi ishaifts iti a nd"@ire"eon seam-m4,- i'ieftabigrais eta M amma that, when earns 19 ,arelowered by rer'a'uaa;

a' shaftflfti aaa'eia rta -16Tjae- 6n;ieaa by lateral eXtensitinsQIto links {which contact with cams 19., It is to under swear that reda-s 15" are so freely mounted the weight; oflinlts' 2 arms fs'iifficienit to rdtate. rotors l 15. This same fattiie canteen is emplo ,ed in Fig. QA A her eififiil lis reentrytunnelswears 23 f" F In Figififtlie'tfehtialiotbr'shtiftltiis ertended through the center, of shaft lS' and cams- 19 and "ma be rot-tited fselectively b any suitablefiiieanslas' silitiwr'i'in' 'llj It is obvious tliat thel at; 5 a'rid'linlcs' a in 1"to"? hitghtdje' repfaced by well known equivalents such as a gear belt or sprocket drive to obtainja simultaneous control of the rotor elei'r'ient' 'oi'fiii (S of thestatomlementsj 1T VVhile I igs'i"'lf'td'"? earn edi'itrol means" for selective inbv''mtirt of any "rot'oi. or smiteebmieeted itliereta' any equivalent concrbrmay beemplojzedsuhias' the,pifn and slotm'eans'in' Figi 9 air the pinion and rack 3 m .g F i1g l* 5 shows j'n detail alsietive can set tor eontro1,lwhi1e"Fig; ash wsaselective be placed on iiiiy dther rbtor shaft of the series and the sam'e simultaneous operation would be obtained.

'un'iso'n; Selective' eontrols for In Fig. 11, I have shown conventionally a central simultaneous control a for a series of rotors A and eoncentriofshaft control means I), cfdjfdr seleetive control of a series of stators B C, D.

In Fig. 12, I have shown conventionally a control (1 mounted on one of the outer rotor shafts and connected to the remaining rotor shafts to move the three rotor shafts in the three stators may be arranged remote fronrthe uiiits afs'a't b,c,'d connected respectively to stators BfC, DZ In Fig. i 13, -'I- have shown; concentric cant'rol sliaft's' di'bffdfall "arranged remote from the condenser units, central slifift"(i beiiig cbniieetetl to' eat-=1 rotor for si'ni'ultanfe'ons operation-thereof and shafts by -c,' (1, conncc'tetl respectively 1 to stators B; C, i'gftl fslrowsi a modification of 'Fig. 1-1' "vhe ieinf the Concentric control"shafts'ex unit', .the'ca'm' and link controls-being located 1 Fig. Ifrs'liows a modification wherein the Fig. in; isyrm' ouifi cau if S aw intention e applied 156a s ies of aid:

ally"aiirie'dfcondetiser unusuas't 'a tors' A fAs being siihultiirleously movable central cdiitrol "a and gears of the 'equiv ale'ntsyi I i. The rotors 'B; C5D, are'jselectively' adjust able by concentric sleeve b; aid. i1 In t-he GPe ratioii of the device, each hn dens e r'iihit is connected vvitir'its related cir cuit which maybe a stage of radio ire q uency In tuning the receiving set to respend 'to'th fre'quency or wave lengtho'f'a patticular signal, =the rotor elements in Fig. 1 are givenfan approximate initial setting by rotating (lial .linob Tand an accurate setting or balanceis "completed .by moving either of th'e oiiter statorswith levers 10, In Fig. '6, in "addition" to "reversing'th'e' stator and rotor I control so" as" to .afi'ord a simul t an'eoiis stator 'control', "means arelshoivn to selectively control any one of the three re-j to'r'e'leir ients', suc'h selective eon trol of each condenser bein'g 'desirable'ineertain circuits. Ithv'ill be btivious that 'iii' igslill to 1'3 {siiiiultiineous control of rotors is obtained from, control #1. "While "l'selec'tive' control stators-is secured byhn'anipulating various concentricshaftcontrols?) 0,71. 1 'i WVhatI elaim is'f .1 "i v j,

"1) In a condenser eti nibination', a plurality of condenser units' each u'iii't having selectively movable plates, means for simultaneously moving corresponding plates in all of said units, and means for selectively moving other plates of the various units each of said means comprising a control. element, said control elements being positioned closely adjacent each other to provide a unicontrol.

2. In a condenser combination, a plurality of condenser units, each unit having selectively movable plates, a plurality of concentric shafts comprising a single set, and means operatively associated with one of said shafts for simultaneously moving corrcsponding plates of all of said units and means associated with others of said shafts for selectively moving other plates of any one unit.

3. A unitary variable condenser comprising a plurality of 'ariable condensers, means for simultaneously varying the capacities of the condensers, and means including a single set of concentrically arranged control shafts for selectively varying the capacity of each condenser comprising the unit, all of said means being operable from a common point to provide a unicontrol.

4. In a condenser combination, a plurality of condenser units, a single set of concentric control shafts, means associated with one of said shafts for simultantwusly varying the capacities of all of said condensers, and means associated With the other shafts for selectively varying the capacities of said condensers.

A unitary condenser comprising, in combination, a plurality of variable condenser units, each unit having a series of main movable plates and an auxiliary movable plate, means for simultaneously moving said main movable plates, a plurality of concentric shafts, and means associated with each concentric shaft for moving a desired auxiliary mt able plate, all of said means being operable from a common point. to provide a unicontrol.

(3. In a condenser combination, a plurality of condenser units, each unit. having selectively movable plates, a plurality of concentric shafts, one of said shafts being connected to corresponding movable plates in all of said units, and. each of said other shafts being connected respectively to other movable plates in the various units.

7. In a condenser combination, a series of aligned condenser units, each unit having selectively movable plates, a control shaft operatively connected to corresponding plates of each unit for simultaneous control thereof, a plurality of tubular shafts concentric with said control shaft, and means associated with said tubular shafts for selcctively moving other plates of each unit.

8. A condenser combination comprising a plurality of variable condenser units, shaft supporting means for the rotatable elements of each condenser unit, means for rotating said means, and means including a smgle set of concentri :ally arranged control shafts for selectively adjusting the normally stationary elements.

9. In a *ondenser combinatimi, a plurality of condensers aligned in a common plane, each condenser having plates selectively m iable in said plane, a plurality of concentric shafts. one of said shafts being connec ed to corresponding movable plates of each condenser for simultaneous rotation thereof, the other of said shafts being connected to the remaining movable plates of said condensers for selective rotation thereof.

10. In a condenser combination, a plurality of condensers aligned in a common plane, each condenser having plates selectively movable in said plane, rotatable shafts for supporting corresponding movable plates in said. condensers, means connecting said shafts for simultaneous rotation thereof, a plurality of tubular shafts surrounding one of said first mentioned shafts, and means connecti g said tubular shafts to other movable plates in said condensers for selective rotation thereof.

In testimony whereof I attix my signature.

VILLIAM J. D()\V. 

